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Head loss coefficient of a totally open butterfly valve
Default

Input data

Diameter

t/D

Output data

k for typical valve

kQ for typical valve

k for best project

kQ for best project

Description

Finds the head loss coefficients for fully open butterfly valves.

Given the diameter and the relation maximum thickness/diameter of a fully open butterfly valve, calculates the k values corresponding to two different types of valves, for the expressions hf = k.U²/2g and ℎf = kQ.Q².

  • For k applicable to:
    hf=k⋅U22⋅g hf = \frac{k \cdot U^2}{2\cdot g}
  • For kQk_Q applicable to:
    hf=kQ⋅Q2 ℎf = k_Q\cdot Q^2

Butterfly valve

References

  • Miller, Donald S. Internal flow systems. BHRA Fluid Engineers, 1978.